Wide and narrow viewing angle driving circuit, driving method and display device

Abstract

The application discloses a wide-narrow viewing angle driving circuit, a driving method and a display device. The wide-narrow viewing angle driving circuit comprises a time sequence controller, a power supply circuit and a driving waveform generating circuit. The time sequence controller generates a first group of initial waveforms and a second group of initial waveforms and outputs one group of initial waveforms according to a viewing angle switching signal. The power supply circuit provides a positive power supply voltage and a negative power supply voltage. The driving waveform generating circuit processes one group of initial waveforms provided by the time sequence controller according to the positive power supply voltage, the negative power supply voltage and a reference voltage, and selects and outputs a target viewing angle driving waveform according to the viewing angle switching signal, so that the dimming box works in a wide viewing angle mode or a narrow viewing angle mode. The time sequence controller in the display device provided by the application can avoid the use of a microprocessor and a digital-to-analog converter to realize the viewing angle switching function. In addition, the corresponding initial waveform is outputted according to the viewing angle switching signal, and the target viewing angle driving waveform is selected and outputted, so that the reliability of the wide-narrow viewing angle driving circuit is improved.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a wide and narrow viewing angle driving circuit, driving method and display device. Background Technology

[0002] As display technology continues to advance, while consumers enjoy the visual experience brought by wide viewing angles, they also have higher requirements for privacy protection of display devices. In response, some current display devices also feature the ability to switch between wide and narrow viewing angles.

[0003] For example, the display device includes at least a dimming box, a display box, and a viewing angle switching drive circuit. The display box is used for normal image display, the dimming box is used to control the viewing angle switching of the display device, and the viewing angle switching drive circuit drives the liquid crystal molecules in the dimming box to tilt relative to the display box so that the display device operates in a wide viewing angle mode or a narrow viewing angle mode.

[0004] Current display devices detect viewing angle switching signals using a microprocessor and output different data to a digital-to-analog converter (DAC) based on the detection results to generate wide-viewing-angle or narrow-viewing-angle driving waveforms. However, this method requires technicians to write code and continuously debug to ensure the microprocessor outputs the required viewing angle driving waveform, which is a waste of manpower. Furthermore, display devices require both a microprocessor and a DAC to implement viewing angle switching, increasing costs. Summary of the Invention

[0005] In view of the above problems, the purpose of this application is to provide a low-cost, high-reliability wide and narrow viewing angle driving circuit, driving method and display device.

[0006] According to one aspect of this application, a wide and narrow viewing angle driving circuit is provided for driving a display device, the display device including a dimming box, comprising:

[0007] A timing controller receives a viewing angle switching signal, generates a first set of initial waveforms and a second set of initial waveforms, and outputs a set of initial waveforms according to the viewing angle switching signal, wherein the viewing angle switching signal indicates that the display device is operating in a wide viewing angle mode or a narrow viewing angle mode.

[0008] The power supply circuit provides both positive and negative power supply voltages.

[0009] The driving waveform generation circuit obtains a reference voltage based on the positive power supply voltage, processes a set of initial waveforms provided by the timing controller based on the positive power supply voltage, the negative power supply voltage, and the reference voltage, and selects to output a target viewing angle driving waveform based on the viewing angle switching signal. The target viewing angle driving waveform drives the dimming box to work in a wide viewing angle mode or a narrow viewing angle mode.

[0010] Optionally, when the viewing angle switching signal indicates that the display device is operating in wide viewing angle mode, the timing controller outputs a first set of initial waveforms; when the viewing angle switching signal indicates that the display device is operating in narrow viewing angle mode, the timing controller outputs a second set of initial waveforms.

[0011] The first set of initial waveforms includes a first initial waveform and a second initial waveform, which are two AC waveforms with equal amplitude, the same frequency, and opposite phase. The second set of initial waveforms includes a third initial waveform and a fourth initial waveform, which are two DC waveforms with equal amplitude.

[0012] Optionally, the driving waveform generation circuit includes:

[0013] A waveform processing unit, connected to the timing controller and the power supply circuit, divides the positive power supply voltage to obtain the reference voltage, and performs amplitude processing on each waveform in a set of initial waveforms provided by the timing controller according to the positive power supply voltage, the negative power supply voltage and the reference voltage, wherein the amplitude processing of the first set of initial waveforms is performed to obtain a first set of intermediate waveforms, and the amplitude processing of the second set of initial waveforms is performed to obtain a second set of intermediate waveforms.

[0014] A waveform selection unit, connected to the waveform processing unit, controls the output of the first set of intermediate waveforms as the target viewing angle driving waveforms when the display device is operating in wide viewing angle mode, and outputs the two reference ground waveforms as the target viewing angle driving waveforms when the display device is operating in narrow viewing angle mode.

[0015] Optionally, the first set of intermediate waveforms includes a first intermediate waveform and a second intermediate waveform. The waveform processing unit increases the high amplitude of the first initial waveform to a positive power supply voltage and decreases the low amplitude of the first initial waveform to a negative power supply voltage to obtain the first intermediate waveform. The waveform processing unit increases the high amplitude of the second initial waveform to a positive power supply voltage and decreases the low amplitude of the second initial waveform to a negative power supply voltage to obtain the second intermediate waveform.

[0016] And / or the second set of intermediate waveforms includes a third intermediate waveform and a fourth intermediate waveform. The waveform processing unit reduces the amplitude of the third initial waveform to a negative power supply voltage to obtain the third intermediate waveform, and the waveform processing unit reduces the amplitude of the fourth initial waveform to a negative power supply voltage to obtain the fourth intermediate waveform.

[0017] Optionally, the waveform processing unit includes:

[0018] A voltage divider unit is connected to the power supply circuit to receive the positive power supply voltage and divide the positive power supply voltage to output the reference voltage. The reference voltage is less than the high amplitude of the first initial waveform and the high amplitude of the second initial waveform, and greater than the low amplitude of the first initial waveform and the low amplitude of the second initial waveform.

[0019] A first operational amplifier, wherein the positive input of the first operational amplifier receives an initial waveform from a set of initial waveforms provided by the timing controller, the inverting input of the first operational amplifier receives the reference voltage, the positive power supply terminal of the first operational amplifier receives the positive power supply voltage, the negative power supply terminal of the first operational amplifier receives the negative power supply voltage, and the output terminal of the first operational amplifier outputs a corresponding intermediate waveform; and

[0020] The second operational amplifier has the following characteristics: its positive input receives another initial waveform from a set of initial waveforms provided by the timing controller; its inverting input receives the reference voltage; its positive power supply receives the positive power supply voltage; its negative power supply receives the negative power supply voltage; and its output outputs the corresponding intermediate waveform.

[0021] Optionally, the waveform processing unit includes:

[0022] First resistor;

[0023] Second resistor;

[0024] A first switching transistor, the control terminal of which receives the viewpoint switching signal, a first terminal of which is connected to the output terminal of a first operational amplifier in the waveform processing unit, and a second terminal of which is grounded via a first resistor and connected to the dimming box to provide a waveform from the target viewpoint driving waveform; and

[0025] The second switch has a control terminal that receives the viewpoint switching signal. The first terminal of the second switch is connected to the output terminal of the second operational amplifier in the waveform processing unit. The second terminal of the second switch is grounded via the second resistor and connected to the dimming box to provide another waveform in the target viewpoint driving waveform.

[0026] Optionally, when the viewing angle switching signal indicates that the display device is operating in wide viewing angle mode, the first switch and the second switch are turned on, and the first set of intermediate waveforms are output as the target viewing angle driving waveform. When the viewing angle switching signal indicates that the display device is operating in narrow viewing angle mode, the first switch and the second switch are turned off, and the two reference ground waveforms are output as the target viewing angle driving waveform.

[0027] According to another aspect of this application, a wide and narrow viewing angle driving method is provided for driving a display device, the display device including a dimming box. The wide and narrow viewing angle driving method includes: generating a first set of initial waveforms and a second set of initial waveforms; and outputting a set of initial waveforms according to the viewing angle switching signal, the viewing angle switching signal indicating that the display device operates in a wide viewing angle mode or a narrow viewing angle mode; and obtaining a reference voltage according to the positive power supply voltage, processing the output set of initial waveforms according to the positive power supply voltage, the negative power supply voltage, and the reference voltage, and selecting and outputting a target viewing angle driving waveform according to the viewing angle switching signal, the target viewing angle driving waveform driving the dimming box to operate in a wide viewing angle mode or a narrow viewing angle mode.

[0028] Optionally, it further includes: performing amplitude processing on each waveform in a set of initial waveforms provided by the timing controller according to the positive power supply voltage, the negative power supply voltage, and the reference voltage, wherein the amplitude processing of the first set of initial waveforms yields a first set of intermediate waveforms, and the amplitude processing of the second set of initial waveforms yields a second set of intermediate waveforms; and controlling according to the viewing angle switching signal, outputting the first set of intermediate waveforms as the target viewing angle driving waveform when the display device is operating in a wide viewing angle mode, and outputting two reference ground waveforms as the target viewing angle driving waveform when the display device is operating in a narrow viewing angle mode.

[0029] According to another aspect of this application, a display device is provided, comprising: a dimming box and a display box stacked together; and a wide and narrow viewing angle driving circuit as described above, which outputs a target viewing angle driving waveform to drive the dimming box to operate in a wide viewing angle mode or a narrow viewing angle mode.

[0030] The wide and narrow viewing angle driving circuit, driving method, and display device provided in this application reuse the timing controller in the display device. The timing controller generates a first set of initial waveforms and a second set of initial waveforms, and outputs a set of initial waveforms based on a viewing angle switching signal. A driving waveform generation circuit processes the set of initial waveforms provided by the timing controller based on the positive power supply voltage, negative power supply voltage, and reference voltage, and selects the target viewing angle driving waveform to drive the dimming box to operate in wide or narrow viewing angle mode based on the viewing angle switching signal. This avoids the need for the display device to use an additional microprocessor and digital-to-analog converter to implement the viewing angle switching function. Furthermore, the method of outputting the corresponding initial waveform through the viewing angle switching signal and selecting the target viewing angle driving waveform again through the viewing angle switching signal improves the reliability of the wide and narrow viewing angle driving circuit.

[0031] Furthermore, the drive waveform generation circuit in the wide and narrow viewing angle driving circuit of this application performs amplitude processing on each waveform in a set of initial waveforms provided by the timing controller, and then controls it again according to the viewing angle switching signal. When the display device is operating in wide viewing angle mode, the first set of intermediate waveforms is output as the target viewing angle driving waveform; when the display device is operating in narrow viewing angle mode, the two reference ground waveforms are output as the target viewing angle driving waveform. That is, this application uses a drive waveform generation circuit with a simple circuit structure and low cost, which can efficiently and reliably provide the target viewing angle driving waveform to realize the viewing angle switching function. Attached Figure Description

[0032] The above and other objects, features and advantages of the present invention will become more apparent from the following description of embodiments of the invention with reference to the accompanying drawings, in which:

[0033] Figure 1 A schematic diagram of the structure of a wide and narrow viewing angle driving circuit of an existing display device is shown.

[0034] Figure 2 A schematic diagram of the wide and narrow viewing angle driving circuit according to an embodiment of this application is shown;

[0035] Figure 3 A schematic diagram of the driving waveform generation circuit in the wide and narrow viewing angle driving circuit according to an embodiment of this application is shown;

[0036] Figure 4a A schematic diagram of the first set of initial waveforms in a wide and narrow viewing angle driving circuit according to an embodiment of this application is shown;

[0037] Figure 4b A schematic diagram of the second set of initial waveforms in the wide and narrow viewing angle driving circuit according to an embodiment of this application is shown;

[0038] Figure 5aA schematic diagram of a target viewing angle driving waveform in a wide and narrow viewing angle driving circuit according to an embodiment of this application is shown;

[0039] Figure 5b A schematic diagram of another target viewing angle driving waveform in a wide and narrow viewing angle driving circuit according to an embodiment of this application is shown;

[0040] Figure 6 A flowchart illustrating a wide and narrow viewing angle driving method according to an embodiment of this application is shown. Detailed Implementation

[0041] Various embodiments of the invention will now be described in more detail with reference to the accompanying drawings. In the various drawings, the same elements are indicated by the same or similar reference numerals. For clarity, the various parts in the drawings are not drawn to scale.

[0042] Figure 1 A schematic diagram of the structure of a wide and narrow viewing angle driving circuit of an existing display device is shown.

[0043] like Figure 1 As shown, the wide and narrow viewing angle driving circuit 110 provides the dimming box 120 with a driving waveform under the wide viewing angle mode WVA or the narrow viewing angle mode NVA.

[0044] The wide and narrow viewing angle driving circuit 110 includes a microprocessor 111, a digital-to-analog converter 112, a first operational amplifier 113, and a second operational amplifier 114. The microprocessor 111 detects the viewing angle switching signal HVA and, through code, outputs different data (Data1 / Data2) based on the detection result. The digital-to-analog converter 112 generates different initial waveforms (S1 / S2) based on the different data. Correspondingly, the initial waveform S1 is input to the first operational amplifier 113 and, after amplification, outputs a driving waveform in wide viewing angle mode WVA to the dimming box 120. The initial waveform S2 is input to the second operational amplifier 114 and, after amplification, outputs a driving waveform in narrow viewing angle mode NVA to the dimming box 120.

[0045] The wide and narrow viewing angle driving circuit 110 requires technicians to write code and continuously debug it so that the microprocessor can output the required viewing angle driving waveform, which wastes manpower. Moreover, the display device needs a microprocessor and a digital-to-analog converter to realize viewing angle switching, which increases the cost.

[0046] The specific implementation methods of this application will be further described in detail below with reference to the accompanying drawings and embodiments.

[0047] One embodiment of this application discloses a display device, taking a liquid crystal display device as an example. The display device includes, for example, a display cell and at least one dimming cell stacked together, as well as the wide and narrow viewing angle driving circuit proposed in this application. The display cell is used for normal image display, the dimming cell is used to control the viewing angle switching of the display device, and the wide and narrow viewing angle driving circuit outputs a target viewing angle driving waveform to drive the dimming cell to work in wide viewing angle mode or narrow viewing angle mode.

[0048] For example, a display device includes a backlight, a first dimming box, and a display box stacked from bottom to top. The first dimming box is used to adjust a wide viewing angle (left-right diffused light or up-down diffused light) in a single direction. In wide viewing angle mode, the first dimming box diffuses the up-down or left-right light. In narrow viewing angle mode, the first dimming box does not change the light path.

[0049] For example, another display device includes a backlight, a second dimming box, a third dimming box, and a display box stacked from bottom to top. The second dimming box is used to adjust the wide viewing angle in one direction (e.g., vertical beam blur), and the third dimming box is used to adjust the wide viewing angle in another direction (e.g., horizontal beam blur). Further, the thin-film transistor ITO electrodes in the second and third dimming boxes extend in mutually orthogonal directions. The driving waveforms received by the two dimming boxes are identical. In wide viewing angle mode, the second dimming box disperses the vertical beam blur, and the third dimming box disperses the horizontal beam blur. In narrow viewing angle mode, the second and third dimming boxes do not alter the light path.

[0050] The aforementioned first to third dimming cells include, for example, at least a first substrate, a second substrate, and a liquid crystal layer between the first and second substrates, which are insulated from each other. A first viewing angle control electrode is disposed on the first substrate, and a second viewing angle control electrode is disposed on the second substrate. The first and second viewing angle control electrodes are, for example, disposed across an entire surface or connected by multiple electrode strips; alternatively, both the first and second viewing angle control electrodes are disposed on the second substrate, and both are connected by multiple electrode strips, with the electrode strips of the first and second viewing angle control electrodes arranged alternately vertically. The wide and narrow viewing angle driving circuits provided below generate target viewing angle driving signals and provide them to the first and second viewing angle control electrodes, thereby driving the liquid crystal molecules in the dimming cell to tilt relative to the display cell, so that the display device operates in a wide viewing angle mode or a narrow viewing angle mode.

[0051] Figure 2 A schematic diagram of the wide and narrow viewing angle driving circuit according to an embodiment of this application is shown. Figure 3 A schematic diagram of the driving waveform generation circuit in the wide and narrow viewing angle driving circuit according to an embodiment of this application is shown. Figure 4aA schematic diagram of the first set of initial waveforms in a wide and narrow viewing angle driving circuit according to an embodiment of this application is shown. Figure 4b A schematic diagram of the second set of initial waveforms in a wide and narrow viewing angle driving circuit according to an embodiment of this application is shown. Figure 5a A schematic diagram of a target viewing angle driving waveform in a wide and narrow viewing angle driving circuit according to an embodiment of this application is shown. Figure 5b A schematic diagram of another target viewing angle driving waveform in a wide and narrow viewing angle driving circuit according to an embodiment of this application is shown.

[0052] like Figure 2 As shown, the wide and narrow viewing angle driving circuit 210 is used to drive the display device. The display device includes at least one dimming box as described above. The wide and narrow viewing angle driving circuit 210 includes a timing controller 211, a power supply voltage 212, and a driving waveform generation circuit 213.

[0053] The timing controller 211 receives the viewing angle switching signal HVA and generates a first set of initial waveforms S1 and a second set of initial waveforms S2. The timing controller 211 also outputs a set of initial waveforms based on the viewing angle switching signal HVA. The viewing angle switching signal HVA indicates whether the display device is operating in a wide viewing angle mode or a narrow viewing angle mode. The viewing angle switching signal HVA is generated by the main control system according to the displayed content, or provided directly through the human-machine interface system. For example, the main control system provides the viewing angle switching signal HVA to indicate whether the display device is operating in a wide viewing angle mode or a narrow viewing angle mode based on whether the displayed content is sensitive.

[0054] The power supply circuit 212 provides a positive power supply voltage VS+ and a negative power supply voltage VS-.

[0055] The drive waveform generation circuit 213 obtains a reference voltage based on the positive power supply voltage VS+, and processes a set of initial waveforms provided by the timing controller 211 based on the positive power supply voltage VS+, the negative power supply voltage VS-, and the reference voltage. It also selects and outputs the target viewing angle drive waveform S3 based on the viewing angle switching signal HVA. The target viewing angle drive waveform S3 drives the dimming box 120 to operate in wide viewing angle mode or narrow viewing angle mode.

[0056] Furthermore, when the viewing angle switching signal HVA indicates that the display device is operating in wide viewing angle mode, the timing controller 211 outputs the first set of initial waveforms S1. When the viewing angle switching signal HVA indicates that the display device is operating in narrow viewing angle mode, the timing controller 211 outputs the second set of initial waveforms S2.

[0057] For example, such as Figure 4aAs shown, the first set of initial waveforms S1 includes a first initial waveform and a second initial waveform S12. The first initial waveform S11 and the second initial waveform S12 are two AC waveforms with equal amplitude and the same frequency F, but opposite phase. The aforementioned AC waveforms can be, for example, square waves, triangle waves, sine waves, etc. Specifically, in this embodiment, a square wave is used as an example for explanation. The high amplitude value of the first initial waveform S11 and the second initial waveform S12 is VDD, and the low amplitude value of the first initial waveform S11 and the second initial waveform S12 is GND (reference ground).

[0058] For example, such as Figure 4b As shown, the second set of initial waveforms S2 includes a third initial waveform S21 and a fourth initial waveform S22, which are two DC waveforms of equal amplitude. Specifically, the amplitude of the third initial waveform S21 and the fourth initial waveform S22 is GND (reference ground waveform).

[0059] Furthermore, such as Figure 3 As shown, the driving waveform generation circuit 213 includes a waveform processing unit 2131 and a waveform selection unit 2132.

[0060] The waveform processing unit 2131 is connected to the timing controller 211 and the power supply circuit 212. It divides the positive power supply voltage VS+ to obtain the reference voltage Vo, and performs amplitude processing on each waveform in a set of initial waveforms provided by the timing controller 211 according to the positive power supply voltage VS+, the negative power supply voltage VS-, and the reference voltage Vo. Specifically, the amplitude of the first set of initial waveforms S1 is processed to obtain the first set of intermediate waveforms, and the amplitude of the second set of initial waveforms S2 is processed to obtain the second set of intermediate waveforms (two reference ground waveforms).

[0061] The waveform selection unit 2133 is connected to the waveform processing unit 2131. According to the viewing angle switching signal HVA, when the display device is working in the wide viewing angle mode, the first set of intermediate waveforms is output as the target viewing angle driving waveform S3. When the display device is working in the narrow viewing angle mode, the second set of intermediate waveforms (two reference ground waveforms) is output as the target viewing angle driving waveform S3.

[0062] Furthermore, the first set of intermediate waveforms includes a first intermediate waveform and a second intermediate waveform. Waveform processing unit 2131 boosts the high amplitude VDD of the first initial waveform S11 to a positive power supply voltage VS+ and reduces the low amplitude GND of the first initial waveform S11 to a negative power supply voltage VS- to obtain the first intermediate waveform. Waveform processing unit 2131 boosts the high amplitude VDD of the second initial waveform S12 to a positive power supply voltage VS+ and reduces the low amplitude GND of the second initial waveform S12 to a negative power supply voltage VS- to obtain the second intermediate waveform.

[0063] Furthermore, the second set of intermediate waveforms includes a third intermediate waveform and a fourth intermediate waveform. Waveform processing unit 2131 reduces the amplitude of the third initial waveform S21 to the negative power supply voltage VS- to obtain the third intermediate waveform, and waveform processing unit 2131 reduces the amplitude of the fourth initial waveform S22 to the negative power supply voltage VS- to obtain the fourth intermediate waveform.

[0064] For example, the waveform processing unit 2131 includes a voltage divider unit 2132, a first operational amplifier OP1, and a second operational amplifier OP2.

[0065] Voltage divider unit 2132 is connected to power supply circuit 212 to receive positive power supply voltage VS+ and divides the positive power supply voltage VS+ to output reference voltage Vo. The reference voltage Vo is less than the high amplitude VDD of the first initial waveform S11 and the high amplitude VDD of the second initial waveform S12, and greater than the low amplitude GND of the first initial waveform S11 and the low amplitude GND of the second initial waveform S12. For example, the high amplitude VDD is 2.5V, the positive power supply voltage VS+ is +5V, the negative power supply voltage VS- is -5V, the low amplitude GND is 0V, and the reference voltage Vo is 1V. It should be noted that the above examples are only for better understanding of this application, and the implementation of this application is not limited thereto. Specifically, voltage divider unit 2132 includes resistors R3 and R4 connected in series between the positive power supply voltage VS+ and ground, and the connection node between resistors R3 and R4 outputs the reference voltage Vo.

[0066] The positive input terminal of the first operational amplifier OP1 receives an initial waveform from a set of initial waveforms provided by the timing controller 211. The inverting input terminal of the first operational amplifier OP1 receives a reference voltage Vo, for example, via resistor R5. The positive power supply terminal of the first operational amplifier OP1 receives a positive power supply voltage VS+. The negative power supply terminal of the first operational amplifier OP1 receives a negative power supply voltage VS-. The output terminal of the first operational amplifier OP1 outputs the corresponding intermediate waveform.

[0067] The positive input terminal of the second operational amplifier OP2 receives another initial waveform from a set of initial waveforms provided by the timing controller 211. The inverting input terminal of the second operational amplifier OP2 is connected to the voltage divider unit 2132 to receive the reference voltage Vo. The positive power supply terminal of the second operational amplifier OP2 receives the positive power supply voltage VS+. The negative power supply terminal of the second operational amplifier OP2 receives the negative power supply voltage VS-. The output terminal of the second operational amplifier OP2 outputs the corresponding intermediate waveform.

[0068] For example, the waveform processing unit 2133 includes a first resistor R1, a second resistor R2, a first switch Q1, and a second switch Q2.

[0069] The control terminal of the first switch Q1 receives the view switching signal HVA. The first terminal of the first switch Q1 is connected to the output terminal of the first operational amplifier OP1 in the waveform processing unit 2131 via resistor R6, for example. The second terminal of the first switch Q1 is grounded via the first resistor R1 and connected to the dimming box 120 to provide a waveform in the target view driving waveform.

[0070] The control terminal of the second switch Q2 receives the view switching signal HVA. The first terminal of the second switch Q2 is connected to the output terminal of the second operational amplifier OP2 in the waveform processing unit 2131 via resistor R7, for example. The second terminal of the second switch Q2 is grounded via the second resistor R2 and connected to the dimming box 120 to provide another waveform in the target view driving waveform.

[0071] In this embodiment, the first switch Q1 and the second switch Q2 are NMOS transistors. The first terminal of each switch is, for example, the drain terminal, the second terminal is, for example, the source terminal, and the control terminal is, for example, the gate terminal. It should be noted that the first switch Q1 and the second switch Q2 can also be PMOS transistors; correspondingly, the polarity of the relevant signals needs to be modified. The first and second terminals of the switches can be interchanged.

[0072] Furthermore, when the viewing angle switching signal HVA (e.g., high level) indicates that the display device is operating in the wide viewing angle mode WVA, the timing controller 211 provides the first initial waveform S11 from the first set of initial waveforms to the positive input of the first operational amplifier OP1, and the output of the first operational amplifier OP1 outputs the first intermediate waveform from the first set of intermediate waveforms. The first switch Q1 is turned on and provides the first intermediate waveform from the first set of intermediate waveforms as a driving waveform S31 in the target viewing angle driving waveform to the first viewing angle control electrode in the dimming box. The timing controller 211 also provides the second initial waveform S12 from the first set of initial waveforms to the positive input of the second operational amplifier OP2, and the output of the second operational amplifier OP2 outputs the second intermediate waveform from the first set of intermediate waveforms. The second switch Q2 is turned on and provides the second intermediate waveform from the first set of intermediate waveforms as another driving waveform S32 in the target viewing angle driving waveform to the second viewing angle control electrode in the dimming box. This causes the dimming box to operate in the wide viewing angle mode.

[0073] Furthermore, when the viewing angle switching signal HVA (e.g., low level) indicates that the display device is operating in the narrow viewing angle mode NVA, the timing controller 211 provides the third initial waveform S21 from the second set of initial waveforms to the positive input of the first operational amplifier OP1, and the output of the first operational amplifier OP1 outputs the third intermediate waveform from the second set of intermediate waveforms. The first switch Q1 is turned off to provide the reference ground waveform as one of the driving waveforms S33 in the target viewing angle driving waveform to the first viewing angle control electrode in the dimming box. The timing controller 211 also provides the fourth initial waveform S22 from the second set of initial waveforms to the positive input of the second operational amplifier OP2, and the output of the second operational amplifier OP2 outputs the fourth intermediate waveform from the second set of intermediate waveforms. The second switch Q2 is turned off to provide the reference ground waveform as another driving waveform S34 in the target viewing angle driving waveform to the second viewing angle control electrode in the dimming box. This causes the dimming box to operate in the narrow viewing angle mode.

[0074] like Figure 5a As shown, in the wide viewing angle (WVA) mode, one of the target viewing angle driving waveforms, S31, is the first intermediate waveform in the first group of intermediate waveforms, with a high amplitude of positive power supply voltage VS+ and a low amplitude of negative power supply voltage VS-. The other driving waveform, S32, is the second intermediate waveform in the first group of intermediate waveforms, with a high amplitude of positive power supply voltage VS+ and a low amplitude of negative power supply voltage VS-. Driving waveforms S31 and S32 are respectively provided to the first and second viewing angle control electrodes of the dimming box to achieve wide viewing angle display.

[0075] like Figure 5b As shown, in the narrow viewing angle mode (NVA), both drive waveforms S33 and S34 in the target viewing angle drive waveform are reference ground waveforms. One drive waveform S33 and the other drive waveform S34 in the target viewing angle drive waveform are respectively provided to the first viewing angle control electrode and the second viewing angle control electrode of the dimming box to achieve narrow viewing angle display.

[0076] Figure 6 A schematic flowchart of a wide and narrow viewing angle driving method for a display device according to an embodiment of this application is shown.

[0077] like Figure 6 As shown, this application also provides a wide and narrow viewing angle driving method for driving a display device, the display device including at least one dimming box as described above, the wide and narrow viewing angle driving method including the following steps:

[0078] Step S310: Generate a first set of initial waveforms and a second set of initial waveforms, and output a set of initial waveforms according to the viewing angle switching signal. The viewing angle switching signal indicates whether the display device is operating in wide viewing angle mode or narrow viewing angle mode.

[0079] Step S320: Obtain the reference voltage based on the positive power supply voltage, process a set of initial waveforms based on the positive power supply voltage, negative power supply voltage and reference voltage, and select the target viewing angle drive waveform based on the viewing angle switching signal. The target viewing angle drive waveform drives the dimming box to work in wide viewing angle mode or narrow viewing angle mode.

[0080] Furthermore, the wide and narrow viewing angle driving method also includes: performing amplitude processing on each waveform in a set of initial waveforms provided by the timing controller according to the positive power supply voltage, the negative power supply voltage, and the reference voltage, wherein the amplitude processing of the first set of initial waveforms yields a first set of intermediate waveforms, and the amplitude processing of the second set of initial waveforms yields a second set of intermediate waveforms; and controlling the viewing angle switching signal, outputting the first set of intermediate waveforms as the target viewing angle driving waveform when the display device is operating in wide viewing angle mode, and outputting the two reference ground waveforms as the target viewing angle driving waveforms when the display device is operating in narrow viewing angle mode.

[0081] The wide and narrow viewing angle driving circuit, driving method, and display device provided in this application reuse the timing controller in the display device. The timing controller generates a first set of initial waveforms and a second set of initial waveforms, and outputs a set of initial waveforms based on a viewing angle switching signal. A driving waveform generation circuit processes the set of initial waveforms provided by the timing controller based on the positive power supply voltage, negative power supply voltage, and reference voltage, and selects the target viewing angle driving waveform to drive the dimming box to operate in wide or narrow viewing angle mode based on the viewing angle switching signal. This avoids the need for the display device to use an additional microprocessor and digital-to-analog converter to implement the viewing angle switching function. Furthermore, the method of outputting the corresponding initial waveform through the viewing angle switching signal and selecting the target viewing angle driving waveform again through the viewing angle switching signal improves the reliability of the wide and narrow viewing angle driving circuit.

[0082] Furthermore, the wide and narrow viewing angle driving circuit of this application performs amplitude processing on each waveform in a set of initial waveforms provided by the timing controller, and then controls it again according to the viewing angle switching signal. When the display device is operating in wide viewing angle mode, the first set of intermediate waveforms is output as the target viewing angle driving waveform; when the display device is operating in narrow viewing angle mode, the two reference ground waveforms are output as the target viewing angle driving waveform. That is, this application uses a driving waveform generation circuit with a simple circuit structure and low cost, which can efficiently and reliably provide the target viewing angle driving waveform to realize the viewing angle switching function.

[0083] As described above, these embodiments of the present invention do not exhaustively cover all details, nor do they limit the invention to the specific embodiments described. Clearly, many modifications and variations can be made based on the above description. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to effectively utilize the present invention and its modifications.

Claims

1. A wide and narrow viewing angle driving circuit for driving a display device, the display device including a dimming box, characterized in that, include: A timing controller receives a viewing angle switching signal, generates a first set of initial waveforms and a second set of initial waveforms, and outputs a set of initial waveforms according to the viewing angle switching signal, wherein the viewing angle switching signal indicates that the display device is operating in a wide viewing angle mode or a narrow viewing angle mode. The power supply circuit provides both positive and negative power supply voltages. The driving waveform generation circuit obtains a reference voltage based on the positive power supply voltage, processes a set of initial waveforms provided by the timing controller based on the positive power supply voltage, the negative power supply voltage, and the reference voltage, and selects to output a target viewing angle driving waveform based on the viewing angle switching signal. The target viewing angle driving waveform drives the dimming box to work in a wide viewing angle mode or a narrow viewing angle mode.

2. The wide and narrow viewing angle driving circuit according to claim 1, characterized in that, When the viewing angle switching signal indicates that the display device is operating in wide viewing angle mode, the timing controller outputs a first set of initial waveforms. When the viewing angle switching signal indicates that the display device is operating in narrow viewing angle mode, the timing controller outputs a second set of initial waveforms. The first set of initial waveforms includes a first initial waveform and a second initial waveform, which are two AC waveforms with equal amplitude, the same frequency, and opposite phase. The second set of initial waveforms includes a third initial waveform and a fourth initial waveform, which are two DC waveforms with equal amplitude.

3. The wide and narrow viewing angle driving circuit according to claim 1 or 2, characterized in that, The driving waveform generation circuit includes: A waveform processing unit, connected to the timing controller and the power supply circuit, divides the positive power supply voltage to obtain the reference voltage, and performs amplitude processing on each waveform in a set of initial waveforms provided by the timing controller according to the positive power supply voltage, the negative power supply voltage and the reference voltage, wherein the amplitude processing of the first set of initial waveforms is performed to obtain a first set of intermediate waveforms, and the amplitude processing of the second set of initial waveforms is performed to obtain a second set of intermediate waveforms. A waveform selection unit, connected to the waveform processing unit, controls the output of the first set of intermediate waveforms as the target viewing angle driving waveforms when the display device is operating in wide viewing angle mode, and outputs the two reference ground waveforms as the target viewing angle driving waveforms when the display device is operating in narrow viewing angle mode.

4. The wide and narrow viewing angle driving circuit according to claim 3, characterized in that, The first set of intermediate waveforms includes a first intermediate waveform and a second intermediate waveform. The waveform processing unit increases the high amplitude of the first initial waveform to a positive power supply voltage and decreases the low amplitude of the first initial waveform to a negative power supply voltage to obtain the first intermediate waveform. The waveform processing unit increases the high amplitude of the second initial waveform to a positive power supply voltage and decreases the low amplitude of the second initial waveform to a negative power supply voltage to obtain the second intermediate waveform. And / or the second set of intermediate waveforms includes a third intermediate waveform and a fourth intermediate waveform. The waveform processing unit reduces the amplitude of the third initial waveform to a negative power supply voltage to obtain the third intermediate waveform, and the waveform processing unit reduces the amplitude of the fourth initial waveform to a negative power supply voltage to obtain the fourth intermediate waveform.

5. The wide and narrow viewing angle driving circuit according to claim 4, characterized in that, The waveform processing unit includes: A voltage divider unit is connected to the power supply circuit to receive the positive power supply voltage and divide the positive power supply voltage to output the reference voltage. The reference voltage is less than the high amplitude of the first initial waveform and the high amplitude of the second initial waveform, and greater than the low amplitude of the first initial waveform and the low amplitude of the second initial waveform. A first operational amplifier, wherein the positive input of the first operational amplifier receives an initial waveform from a set of initial waveforms provided by the timing controller, the inverting input of the first operational amplifier receives the reference voltage, the positive power supply terminal of the first operational amplifier receives the positive power supply voltage, the negative power supply terminal of the first operational amplifier receives the negative power supply voltage, and the output terminal of the first operational amplifier outputs a corresponding intermediate waveform; and The second operational amplifier has the following characteristics: its positive input receives another initial waveform from a set of initial waveforms provided by the timing controller; its inverting input receives the reference voltage; its positive power supply receives the positive power supply voltage; its negative power supply receives the negative power supply voltage; and its output outputs the corresponding intermediate waveform.

6. The wide and narrow viewing angle driving circuit according to claim 3, characterized in that, The waveform processing unit includes: First resistor; Second resistor; A first switching transistor, the control terminal of which receives the viewpoint switching signal, a first terminal of which is connected to the output terminal of a first operational amplifier in the waveform processing unit, and a second terminal of which is grounded via a first resistor and connected to the dimming box to provide a waveform from the target viewpoint driving waveform; and The second switch has a control terminal that receives the viewpoint switching signal. The first terminal of the second switch is connected to the output terminal of the second operational amplifier in the waveform processing unit. The second terminal of the second switch is grounded via the second resistor and connected to the dimming box to provide another waveform in the target viewpoint driving waveform.

7. The wide and narrow viewing angle driving circuit according to claim 6, characterized in that, When the viewing angle switching signal indicates that the display device is operating in wide viewing angle mode, the first and second switching transistors are turned on, and the first set of intermediate waveforms is output as the target viewing angle driving waveform. When the viewing angle switching signal indicates that the display device is operating in narrow viewing angle mode, the first switch and the second switch are turned off, and the two reference ground waveforms are output as the target viewing angle driving waveforms.

8. A wide and narrow viewing angle driving method for driving a display device to which the wide and narrow viewing angle driving circuit of claim 1 is applied, the display device comprising a dimming box, characterized in that, include: Generate a first set of initial waveforms and a second set of initial waveforms, and output a set of initial waveforms according to the viewing angle switching signal, wherein the viewing angle switching signal indicates that the display device is operating in a wide viewing angle mode or a narrow viewing angle mode; as well as A reference voltage is obtained based on the positive power supply voltage, and a set of initial waveforms are processed based on the positive power supply voltage, the negative power supply voltage, and the reference voltage. A target viewing angle driving waveform is selected based on the viewing angle switching signal, and the target viewing angle driving waveform drives the dimming box to work in wide viewing angle mode or narrow viewing angle mode.

9. The wide and narrow viewing angle driving method according to claim 8, characterized in that, Also includes: The amplitude of each waveform in a set of initial waveforms provided by the timing controller is processed according to the positive power supply voltage, the negative power supply voltage and the reference voltage, wherein the amplitude of the first set of initial waveforms is processed to obtain a first set of intermediate waveforms, and the amplitude of the second set of initial waveforms is processed to obtain a second set of intermediate waveforms. as well as Controlled by the viewing angle switching signal, when the display device is operating in wide viewing angle mode, the first set of intermediate waveforms is output as the target viewing angle driving waveform, and when the display device is operating in narrow viewing angle mode, the two reference ground waveforms are output as the target viewing angle driving waveform.

10. A display device, characterized in that, include: A stacked dimming box and display box; as well as The wide and narrow viewing angle driving circuit as described in any one of claims 1-7 outputs a target viewing angle driving waveform to drive the dimming box to operate in wide viewing angle mode or narrow viewing angle mode.

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